Gas water heater



c. M. OSTERHELD GAS WATER HEATER Filed Aug. 24, 1946 Feb. 13, 1951INVENTOR,

CLARK M. OSTERHELD ATT'Y Patented Feb. 13, 1951 OFFICE GAS WATER HEATER-Clark M. Qsterheld, Stoughton, Wis, assignor to McGraw Electric Company,Elgin, 111., a corporation of Delaware Application August 24, 1946,Serial No. 692,902

1 Claim.

My invention relates to gas water heaters and particularly to gas heatedWater heaters.

One object of my invention is to provide means for preventing attack ofthe hot gases of combustion n the wall of the flue in a hot water tank.

Another object of my invention is to provide a removable lining for theflue carrying off the products of combustion of a gas heater.

Another object of my invention is to provide a single removable aluminumlining for the flue having bafile plates connected thereto.

Other objects of my invention will either be apparent from a descriptionof one form of device embodying my invention or will be set forth insaid description and particularly pointed out in the appended claim.

In the drawings,

Figure 1 is a vertical, sectional view through a domestic hot water tankembodying my invention,

Fig. 2 is a view in horizontal section therethrough taken on the line2--2 of Fig. 1,

Fig. 3 is a fragmentary view in front elevation of a baiiie plate, and,

Fig. 4 is a fragmentary sectional View thereof taken on the line 4-4 ofFig. 3.

Referring first of all to Fig. 1 of the drawings I have thereillustrated an ordinary domestic hot water tank H having a, lowerclosure member I3 connected therewith, said closure member having a coldwater inlet pipe 15, and an upper closure plate I! having a hot wateroutlet pipe [9 connected therewith. A mass it of heat-insulatingmaterial such as rock wool surrounds tank H and is held in place by anouter casing 23.

The tank II is provided with an inner flue 25 for upward flow and escapeof the products of combustion generated by a gas burner 21 which gasburner is positioned below the tank II. In order to protect the insidesurface of the Wall of the flue 25 from attack by the products ofcombustion, I provide a lining 29 which is preferably made of relativelythin aluminum so that it may easily have its upper and lower ends bentoutwardly so that the lining 29 may be held in proper operative positionin flue 25.

I provide a plurality of bevel plates 3| here shown as four in numberand comprising a relatively narrow elongated strip of aluminum which hasbeen bent to substantially L-shape in lateral section. Bent-over baflieportions 33 are provided in the strip 3| so that the products ofcombustion are slowed up at least a certain amount and since the narrowedge 35 of the strip 3| is riveted or otherwise suitably secured to theinside surface a! the conduit 29, a relatively large amount of heat willbe extracted from the upwardly flowing products of combustion which willflow through the wall of tube 25 and from there into the water.

I may also provide an anti-corrosion unit 31, which may comprise a rodof magnesium either with or without a resistor connected in serieselectric circuit with said rod and with the Water in the tank whereby Iam able to reduce attacks on the inside surface of the tank H and on theoutside surface of the flue 25, that is that surface of the tank and ofthe flue engaged by the water.

The use of the conduit or flue lining 29 protects the inner surface ofthe flue and causes a slowing down of the upward flow of the products ofcombustion so that a much better heater is obtained than would be thecase without the use of a lining of aluminum such as herein set forth.

Various modifications may be made in the device embodying my inventionwithout departing from the spirit and scope thereof, and all suchmodifications clearly coming, within the scope of the a pended claimshall be considered as part of my invention.

I claim as my invention:

In combination in a water heater assembly, a storage tank, a gas burnertherebelow, said tank having an open-ended flue passing through saidtank and the liquid therein and carrying hot gases of combustion fromsaid burner, and a removable thin tubular lining of aluminum separatefrom the weight-supporting and pressure-sustaining structure of saidtank and flue, said lining fitting snug in said flue to provide goodheat conduction from the gases of combustion to the wall of the flue,said lining being sufficiently thin that it is mechanically Weakcompared to the structural members of the flue whereby it may be crimpedfor retaining it in place and may also be removed, all without risk ofinjuring the tank or flue.

CLARK M. OSTERHELD.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,211,858 Johnson Jan. 9, 19171,553,922 Aram Sept. 15, 1925 1,712,543 Bayer May 14, 1929 1,912,834Geyer June 6, 1933 FOREIGN PATENTS Number 7 Country Date 699,059 France-r Dec. 8, 1930

